Javascript Validation for email(正则表达式) 英文翻译

Try testing the following form with valid and invalid email addresses. The code uses javascript to match the users input with a regular expression. 函数代码：

复制代码 代码如下:

function validate(form_id,email) { var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/; var address = document.forms[form_id].elements[email].value; if(reg.test(address) == false) { alert('Invalid Email Address'); return false; } }

In the forms ‘onsubmit' code call javascript:return validate(‘form_id','email_field_id') 使用方法：

复制代码 代码如下:

<form id="form_id" method="post" action="action.php" onsubmit="javascript:return validate('form_id','email');"> <input type="text" id="email" name="email" /> <input type="submit" value="Submit" /> </form>

You should not rely purely on client side validation on your website / web application, if the user has javascript disabled this will not work. Always validate on the server. from:　http://www.white-hat-web-design.co.uk/blog/javascript-validation/

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